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I got into the chambers when i built it. A little unshrouding and a light polish. They're 63cc (shaved heads) and fairly consistent, i measured a selection to prove my method. I know i should do them...

Of course the pistons were damaged from the first round of detonation caused by the oil but i had the tune sorted to the point where it's PB came with mildly pocked pistons. This round did seem to be...

Time to drag out a relic!

So the detonation reared its ugly head again. I'm guessing fuel this time. Same tune that i used on my PB pass, same track, similar conditions, no other changes, ran next...

Car is speed density O/L. I have both hi and lo octane tables matched, and p/n + in gear tables made equivalent, as was my initial understanding in the first days of trying to learn.

I'll play...

Thankyou. I've loaned my wideband to a friend who i rebuilt a Dellorto for as part of the service so won't make changes till i get that back.

i took the car on a long 3day cruise this weekend and...

I'll reply soon thanks to you both guys. Been away from the car for a bit.

It's a hot start issue so why am i chasing the colder areas? Sorry if i misinterpreted.

Sorry i missed this at the time mate. I'm running the factory supercharged 6cyl injectors which if i recall are the white Bosch 36 lb/hr 0280155868

Once again i'm finding great info here related to my car. Thanks to all involved. I too am chasing that lean hot start up, it'll race straight to 18-19/1 on a commanded idle AFR of 15.2-15.3 (big...

I've never played with those figures (above 75kpa) in the OL table so they're another remnant of the old tune from whichever shop did this back in the day, previous owner. I use the PE values for all...

Well i got very sidetracked. Haha. Short term i have a street tune at 22degrees total and a track tune with 26, all in slightly earlier using octane booster. So far that's seen me through ping free....

Final update for closure.

Ran the car last week. PB'd at [email protected]. Pretty bloody happy for 3350lbs, stock stroke aspo LS1, driven to the track with full exhaust! 25degrees total. Happy as Larry....

Weeeeeeeeell, it was burst knock. Zerod out the table that had 8 degrees across the board and got all my timing back. No idea why it was remaining on so long?

Today the car was just behaving like...

Cheers. I'm trying to explain my concerns in laymans terms to help other newbies just learning to tune and he's doing a great job of not getting lost in my waffle and identifying core issues.

Ignore the "latest no ping", this is the log 133984133985

Ready for round 2 my super helpful friend? The case of the mysteriously altering idle AFR, false knock and missing WOT timing?

After waiting a bloody fortnight for my starter solenoid i got her...

Ok, so i'll try make sure not to be heavy on the throttle to avoid burst knock oming into play while i try fine tune, rather just progressive sweep on the pedal so it adheres to commanded values and...

Abso-bloody-lutely

Do you recommend turning off burst knock so that as i take timing from the table it's only showing true knock (if any) and timing retard, then once it's all sorted put the burst...

I'm not stomping the throttle like a petulant child but yes it is a rapid application so we'll call it that :) . Burst knock seems to be effective in that log as it's below specified timing after...

Ah ok, so it was a double whammy of retard. Cheers. I'm not dropping gears on any of those pulls, just a fast roll in to full throttle. From what i read burst knock is a preventative timing reduction...

Just the knock values for now as i wanted to ensure i was seeing their direct benefit before any timing changes, which i now know i am. Not sucking oil is a huge improvement too! Haven't had any...

I ran with the values in the tune file you posted and it's now logging KR every hit of the throttle, up to about 4 degrees, then lets it back in. See attached log.

2nd gear stab from a steady...

This thing took 2 g/sec of base running air to get happy again! Then all the VE work was about 5-8% out in light throttle work/cruising. She's back to running sweet at light loads and i went old...

Aplogies, haven't been on here or working on the car. Now things have settled i'm back at it.

I have no PCV. This setup was an interim as i have stack injection to go on so i set up with no PCV,...

So i had this table zero'd up till about 60deg IAT at the drags, running octane booster as i wanted timing steady despite hot lapping it. Then i forgot to return it to stock and have had pinging...